I just picked up a Vivitar 450mm f4.5 Series 1 mirror lens and would not go for
anything any slower. This one has Aspherical element (s) and is a good
performer. I compare it to a 600mm f8 solid cat from Vivitar I have as well and
it is so much brighter and focuses so much closer. The 450 is still compact. If
you really like mirror lenses I can't say enough about the 450mm Vivitar-but I
hate to turn you away from an Olympus : ) Besides-the Vivitar is a rare find.
John
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